I noticed that if I login to SE in a private mode window using Firefox v57.0 Quantum (x64 on Windows 7 Pro) and then open a second private mode window and navigate to e.g. security.stackexchange.com, I see the same login session in that second private browsing window.

On another hand, if I open a third, regular (non-private) window, and navigate to SE, I do not have access to the login session but must login separately.

So what is happening is that all private mode windows have access to the same login sessions. I would have thought that each private mode window would encapsulate its own login sessions.

Is this expected behavior?

  • 1
    Private mode uses its own session. It’s just discarded when the last process is closed. What you describe is expected behavior
    – Ramhound
    Nov 23, 2017 at 19:55
  • Same thing happening to me too but in my case it is opening an email Id which I have not logged on to in the regular window. Seems like a serious bug to me. Jan 12, 2018 at 4:44


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